Open-hearth doorframe



Feb. 17, 1931. c. G. WATSON OPEN HEARTH DOORFRAME Filed Dec. '7, 1928 IN V EN TOR.

BY TTORNEY '5 FM afar/e5 (EM 4km Patented Feb. 17, 1931 PATENT OFFICE CHARLES G. WATSON, OF YOUNGSTOWN, OHIO OPEN-HEARTH DOORFRAME Application filed December 7, 1928. Serial No. 324,563.

This invention relates to water cooled open hearth door frames. The principal object of the invention is to provide new and useful improvements in devices of this kind in which the door frame is made of two plates with a welded joint located at a central position of each edge of said frame and a central position of door opening.

A further object of the invention is to provide an inturned curved edge of each plate meeting at a central position in reference to the two plates.

A further object of the invention is to provide a tapered welding edge, where edges of the two plates meet, in order to provide a greater welding area than that which is common where welding edges meet in a common plane.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the in vention herein disclosed, can be made within the scope of what is claimed, without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawing, wherein Figure 1 is a front elevation of the frame and door with a part broken away on door.

Figure 2 is a cross section taken on line 22 of Figure 1.

Figure 3 is a cross section taken on line 3-3 of Figure 1.

Figure 4 is a cross section taken on line 44 of Figure 1.

One of the difficulties commonly encountered in the use of door frames and doors subjected to a wide range of temperature is that of providing a structure that will withstand, to a desirable degree, the continued expansion and contraction due to the varying range of temperature. Where open hearth frames are constructed of sheet metal and welded together by the meeting of edges in a common plane, the resulting strain, due to expansion and contraction, usually finds this particular part of the structure weak, breaking down before the rest of the structure has become equally weakened.

In the drawing 1 designates a water cooled open hearth frame. 2 designates, a water cooled door which is made of sheet metal and provided with stay bolts 3 for the purpose of reenforcing and holding front and back plates in parallel relation to each other in order that ample room for a circulation of water may be maintained within the door structure. The water cooled door 2 is provided with an ordinary opening 4. It will be seen by referring to Figure 2 that the water cooled door 2 is provided with inturned edges 5 functioning between guide rails 6, being secured to an outer surface of the water cooled door frame 1. It will also be seen that there is provided suitable lift arm 7 for the manipulation of the water cooled door 2. The water cooled door 2 is provided with a Water inlet 8 and a water outlet 9.

By referring to Figure 2 it will be seen that the water cooled door frame is constructed of a front and a back sheet of metal spaced apart providing a chamber 10 for the reception of water. It will also be seen that in order to properly reenforce and strengthen the frame, stay bolts 11 have been provided. The front and back plates of the water cooled frame 1 are formed so as to have inturned curved edges 12. Extreme ends 13 of the in turned curved edges 12 are provided with tapered welding edges 14 in order to provide an extended area for the reception of the weld seam 15.

In order that the water cooled door frame 1 may be supplied with water there is provided a water inlet 16, distributing water through pipes 17 and 18 which have delivery ends 19 and 20 so-that the cool water may be released where the heat is the greatest. The water is then finally discharged through a water outlet 21. It is understood that when the furnace is in operation there is a continuous stream of water passing into and out of the water cooled door frame 1 and 'the water cooled door 2. The water cooled frame is provided with securing and manipulating members 22.

It is important in the construction of water cooled door frames to construct the same so that should the outer plate of the door frame be subjected to an accidental thrust, such as frequently occurs in the manipulation of a furnace in char g the same, that weld should be placed w ere the least amount of damage would result from such a thrust. In the ordinary method of constructin water cooled door frames a weld is frequent y emplo ed on the outer plate construction of the rame, which is undesirable in that the same will not meet unexpected strains or thrusts as readily, and without resulting damage by using the welded seam as described in my application.

What I claim is A water cooled door frame for furnaces including front and back plates having their complementary portions surrounding the door opening curved inwardly and then away from the door opening and welded to-. gether at their abutting edges to dispose the resulting weld seam inwardly of other portions of the frame which constitute the wall of the door openin to thereby protect the weld seam around t e door openlng against damage incident to both contact of material against the wall of the door opening and thrusts against the frame during manipulation of the furnace.

In testimony whereof I aflix my signature.

CHARLES G. WATSON. 

